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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Amortized cost of trading securities $ 432,000 $ 182,000
Amortized cost of investment securities available-for-sale 432,176,000 1,074,475,000
Allowance for loan losses $ 204,809,000 $ 116,539,000
Preferred stock, shares authorized 10,000,000 10,000,000
Common stock, par value $ 1 $ 1
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 59,885,234 59,885,234
Common stock, shares outstanding 51,387,071 51,398,956
Treasury stock, at cost, shares 8,498,163 8,486,278
Tax effect on accumulated other comprehensive income (loss) $ (1,529,000) $ 206,000
Investment available-for-sale, allowance for credit loss $ 0 $ 0
Series A    
Preferred stock, shares issued 1,340,000 1,340,000
Preferred stock, shares outstanding 1,340,000 1,340,000
Preferred stock, liquidation value $ 25 $ 25
Series B    
Preferred stock, shares issued 1,380,000 1,380,000
Preferred stock, shares outstanding 1,380,000 1,380,000
Preferred stock, liquidation value $ 25 $ 25
Series D    
Preferred stock, shares issued 960,000 960,000
Preferred stock, shares outstanding 960,000 960,000
Preferred stock, liquidation value $ 25 $ 25